Essentially you are changing the moment of the plane. It will be sluggish in entry of manuvers, it will over rotate in spins, it will weaken the fuse, or after you beef it up in the tail to compensate for the servo installation in the tail its heavy, and most of all, it flies like sh*t. I had one customer tell me that he did it despite my recomendation against it, and he found out the hard way. He complainted of the lack of flight performance until he put the servos where they belonged. Needless to say, you bought the kit, you can bash the kit anyway you desire. I am not like the 'Big Boys', I do extensive testing with different designs before I release a kit. I fly what I design. Comparing the Aeron with the Wacky-Bee III (or the Hard Bet, or Ecstasy for that matter) is not appropriate. These are totally different types of designs. If you want this aircraft for hovering only, then servos in the tail would be fine, though they will screw-up all the other unique flying characteristics of the Aeron that my customers buy the Aeron for.
Like I said before, you can do whatever you want, but needless to say, I highly recommend against it!
Kevin